Literature DB >> 12225610

Statistics review 4: sample size calculations.

Elise Whitley1, Jonathan Ball.   

Abstract

The present review introduces the notion of statistical power and the hazard of under-powered studies. The problem of how to calculate an ideal sample size is also discussed within the context of factors that affect power, and specific methods for the calculation of sample size are presented for two common scenarios, along with extensions to the simplest case.

Entities:  

Mesh：

Year:  2002        PMID： 12225610      PMCID： PMC137461          DOI： 10.1186/cc1521

Source DB:  PubMed          Journal:  Crit Care        ISSN： 1364-8535            Impact factor:   9.097


  6 in total

1.  Prone positioning of patients with acute respiratory failure.

Authors:  Jan G Zijlstra; Jack J M Ligtenberg; Tjip S van der Werf
Journal:  N Engl J Med       Date:  2002-01-24       Impact factor: 91.245

2.  Early goal-directed therapy in the treatment of severe sepsis and septic shock.

Authors:  E Rivers; B Nguyen; S Havstad; J Ressler; A Muzzin; B Knoblich; E Peterson; M Tomlanovich
Journal:  N Engl J Med       Date:  2001-11-08       Impact factor: 91.245

3.  The acute respiratory distress syndrome, mechanical ventilation, and the prone position.

Authors:  A S Slutsky
Journal:  N Engl J Med       Date:  2001-08-23       Impact factor: 91.245

4.  Effect of prone positioning on the survival of patients with acute respiratory failure.

Authors:  L Gattinoni; G Tognoni; A Pesenti; P Taccone; D Mascheroni; V Labarta; R Malacrida; P Di Giulio; R Fumagalli; P Pelosi; L Brazzi; R Latini
Journal:  N Engl J Med       Date:  2001-08-23       Impact factor: 91.245

5.  Statistical power, sample size, and their reporting in randomized controlled trials.

Authors:  D Moher; C S Dulberg; G A Wells
Journal:  JAMA       Date:  1994-07-13       Impact factor: 56.272

6.  Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome.

Authors:  Roy G Brower; Michael A Matthay; Alan Morris; David Schoenfeld; B Taylor Thompson; Arthur Wheeler
Journal:  N Engl J Med       Date:  2000-05-04       Impact factor: 91.245
  6 in total
  169 in total

1.  Intercohort gene expression co-analysis reveals chemokine receptors as prognostic indicators in Ewing's sarcoma.

Authors:  Idriss M Bennani-Baiti; Aaron Cooper; Elizabeth R Lawlor; Maximilian Kauer; Jozef Ban; Dave N T Aryee; Heinrich Kovar
Journal:  Clin Cancer Res       Date:  2010-06-04       Impact factor: 12.531

2.  Contrast Sensitivity With a Subretinal Prosthesis and Implications for Efficient Delivery of Visual Information.

Authors:  Georges Goetz; Richard Smith; Xin Lei; Ludwig Galambos; Theodore Kamins; Keith Mathieson; Alexander Sher; Daniel Palanker
Journal:  Invest Ophthalmol Vis Sci       Date:  2015-11       Impact factor: 4.799

3.  Lack of correlation between reaction speed and analytical sensitivity in isothermal amplification reveals the value of digital methods for optimization: validation using digital real-time RT-LAMP.

Authors:  Eugenia M Khorosheva; Mikhail A Karymov; David A Selck; Rustem F Ismagilov
Journal:  Nucleic Acids Res       Date:  2015-09-10       Impact factor: 16.971

Review 4.  Conducting a successful residency research project.

Authors:  Jeffrey F Barletta
Journal:  Am J Pharm Educ       Date:  2008-08-15       Impact factor: 2.047

5.  Tooth wear prevalence and sample size determination : a pilot study.

Authors:  Nama Bibi Saerah Abd Karim; Noorliza Mastura Ismail; Lin Naing; Abdul Rashid Ismail
Journal:  Malays J Med Sci       Date:  2008-10

6.  Why perform a priori sample size calculation?

Authors:  Forough Farrokhyar; Deven Reddy; Rudolf W Poolman; Mohit Bhandari
Journal:  Can J Surg       Date:  2013-06       Impact factor: 2.089

7.  Blockade of glutamate release by botulinum neurotoxin type A in humans: a dermal microdialysis study.

Authors:  Larissa Bittencourt da Silva; Ali Karshenas; Flemming Winther Bach; Sten Rasmussen; Lars Arendt-Nielsen; Parisa Gazerani
Journal:  Pain Res Manag       Date:  2014 May-Jun       Impact factor: 3.037

8.  Prophylactic closure of trocar orifices with an intraperitoneal mesh (ventralex) in laparoscopic bariatric surgery.

Authors:  Andrés Sánchez-Pernaute; Elia Pérez-Aguirre; Alejandra García Botella; Lorena Rodríguez; Esteban Martín Antona; Juan Cabeza; Domingo Jiménez Valladolid; Miguel Angel Rubio; Isabel Delgado; Antonio Torres
Journal:  Obes Surg       Date:  2008-06-24       Impact factor: 4.129

9.  Improving the reporting of adverse drug reactions: a cluster-randomized trial among pharmacists in Portugal.

Authors:  Maria T Herdeiro; Jorge Polónia; Juan J Gestal-Otero; Adolfo Figueiras
Journal:  Drug Saf       Date:  2008       Impact factor: 5.606

10.  Methods and Biostatistics: a concise guide for peer reviewers.

Authors:  A Kyrgidis; S Triaridis
Journal:  Hippokratia       Date:  2010-12       Impact factor: 0.471
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